Fix link to book

Author: danielgblanco

README.md

@@ -1,6 +1,6 @@
 # Apress Source Code
 
-This repository accompanies [Practical OpenTelemetry: Adopting Open Observability Standards Across Your Organization](https://www.link.springer.com/book/10.1007/9781484290743)
+This repository accompanies [Practical OpenTelemetry: Adopting Open Observability Standards Across Your Organization](https://link.springer.com/book/10.1007/978-1-4842-9075-0)
 by Daniel Gomez Blanco (Apress, 2023).
 
 [comment]: #cover